Drill

Details Drill Drill

B - Operations, Transporting

23

B

77/35

B23B 51/02 (2006.01)

Patent

CA 1213760

ABSTRACT OF THE DISCLOSURE A drill bit is made of cemented carbide. To compensate for the brittleness of cemented carbide, the ratio of the diameter of the web portion to the drill bit diameter is set in the range of 25% to 35%, and the flute width ratio is set in the range of 0.4 : 1 to 0.8 : 1. Further, to decrease the cutting resistance on the drill bit, the radial rake angle .theta.2 of the cutting lip measured at positions spaced at least 2/3 of the drill bit diameter toward the outer peripheral side is set in the range of - 5° to positive. Furthermore, to promote the chip ejecting function, the relative distance between the cutting lip and the flute wall opposed thereto is decreased.

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